Question

give and account of different theories of ascent sap
​

Answer 1

The theory states that transpiration pull or tension, cohesion property of water, and hydration of the cell walls (i.e., adhesion) are collectively responsible for the ascent of sap.A negative pressure or tension due to transpiration is transmitted through the continuous water column within the xylem to the root.

Answer 2

• Root Pressure Theory
• Physical Force Theories:
• Transpiration Pull and Cohesion of Water Theory

The most widely accepted theory for the ascent of sap in the tree is the continuous movement of water from the stomata of the leaves to the atmosphere. Complete answer: Transpirational pull and cohesion theory of Dixon and Joly is the most widely accepted theory for the ascent of sap in trees.